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Cognitive performance in unipolar old-age depression: a longitudinal study.

Alexandra Pantzar1, Anna Rita Atti1,2, Laura Fratiglioni1,3

  • 1Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden.

International Journal of Geriatric Psychiatry
|June 2, 2016
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Cognitive deficits in older adults with depression may be temporary, not permanent vulnerabilities. These deficits, particularly in processing speed and attention, could be targeted for treatment and monitored for recovery.

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Area of Science:

  • Gerontology
  • Neuroscience
  • Psychiatry

Background:

  • Cognitive deficits in older adults with depression show inconsistent findings.
  • Depression's episodic nature necessitates repeated cognitive assessments to understand deficit stability and reversibility.

Purpose of the Study:

  • To investigate the stability and reversibility of cognitive deficits in older adults across different depression states.
  • To compare cognitive performance in depressed-remitted, remitted-depressed, and persistently nondepressed older adults against healthy controls.

Main Methods:

  • Longitudinal study of dementia-free participants (≥60 years) from the Swedish National Study on Aging and Care in Kungsholmen.
  • Neuropsychological testing at baseline and follow-up (max 6 years) comparing four groups: depressed-remitted, remitted-depressed, nondepressed-depressed, and matched healthy controls.
  • Statistical analysis using Mixed ANCOVAs, controlling for age and gender.

Main Results:

  • Depression was associated with deficits in processing speed, attention, executive function, and category fluency.
  • In remitted states, deficits were mainly in processing speed and attention, and attenuated after excluding benzodiazepine users.
  • A general cognitive decline was observed across all groups, with the nondepressed-to-depressed group showing exacerbated decline.

Conclusions:

  • Cognitive deficits in depression appear more transient than stable, suggesting they are potential treatment targets.
  • Repeated cognitive assessments can serve as a marker for treatment response in older adults with depression.